Which of the Following Statements About Correlation Coefficients Is TRUE

Multiple Choice

Which of the following statements about correlation coefficients is TRUE?

A) The correlation coefficient equals the proportion of times two variables lie on a straight line.
B) The correlation coefficient will be +1.0 only if all the data lie on a perfectly horizontal straight line.
C) The correlation coefficient measures the fraction of outliers that appear in a scatterplot.
D) The correlation coefficient is a unitless number and must always lie between -1.0 and +1.0, inclusive.